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In this activity, students use an interactive tool to simulate how scientists collected and used sample data to estimate elephant population sizes.

DNA is all around us — even in the air we breathe. Now scientists have found that air quality monitoring stations — which pull in air to test for pollution — also pick up lots of DNA that can reveal what plants and animals have been in the area.

This Click & Learn traces the flow of energy from the Sun all the way to cells within organisms. The embedded questions and calculations guide students’ understanding of how energy is distributed through a variety of ecosystems.

Scientists who tracked humpback whales in Australia noticed that fewer whales wailed to find mates as their population grew.

Scientists have uncovered new clues about a curious fossil site in Nevada, a graveyard for dozens of giant marine reptiles.

This Click & Learn shows that keystone species exist across a variety of ecosystems and can exert their influence in different ways.

Scientists discovered the oldest known DNA and used it to reveal what life was like 2 million years ago in the northern tip of Greenland.

From South Dakota and Oklahoma to Alaska and Alberta, Indigenous groups in the U.S. and Canada are leading efforts to restore bison across North America.

Oxygen levels have dropped in hundreds of lakes in the United States and Europe over the last four decades, a new study found.

Killer whales that feast on seals and hunt in small packs are thriving while their widely beloved siblings are dying out.

In this Click & Learn, students explore mathematical models that describe how populations change over time and apply these models to the invasive lionfish population in the Bahamas. They also use data from other species to learn how density-dependent factors limit population size.

Gorillas are highly sociable animals – up to a point. A crowded mountain can make silverbacks more violent, scientists say.